Charging an electric car: how to make it simple and predictable
For most owners, charging an electric car does not happen at a public charging station but in their own driveway, typically at night, while they sleep. That is exactly why it is not the maximum charging speed that decides how comfortable driving electric is, but how well charging fits into your daily routine.
On the Voltie blog we look at everyday EV questions from a practical point of view. In this article we go through what makes charging an electric car simple and predictable at home and on longer trips, and what is worth paying attention to when choosing a charger.
The biggest advantage of home charging is not speed but timing. The car charges when you would not be using it anyway: you plug it in in the evening, and it is ready to go in the morning. No need to look for a free charger, queue, or plan your day around a charging stop.
Charging time is also easy to plan. A 22 kW three-phase (3×32 A) wall charger charges an average battery in a few hours, and with a single-phase connection the maximum is 7.4 kW (1×32 A), which is also more than enough overnight. The charging current can be set freely between 6 and 32 A, so the charger adapts to the existing grid connection, not the other way round.
The other important difference is dynamic load management (DLM): it monitors the household's consumption phase by phase and adjusts the charging power to it, so the main breaker does not trip even when the hob, the air conditioning and the charging are all running at once. The feature requires an external smart meter (SensorBox), which is an accessory ordered separately.
Conventional socket charging is slow, and household sockets are not designed for this kind of load in the long run. A modern wall charger, by contrast, is built for continuous operation and comes with several protection functions: the Voltie, for example, has 6 mA DC leakage detection built in, so no separate type B RCD is needed, a type A is enough.
We covered the common misconceptions about home charging in detail in an earlier article; it is worth a quick read before you decide on the installation.
On longer trips, charging an electric car calls for more deliberate planning. The European charging network has become considerably denser in recent years (current charging point statistics by country can be checked in the database of the European Alternative Fuels Observatory), but it still matters what charging power is available at a given location.
A few practical points that make things easier before a longer trip:
● Start with a full battery: leaving home with a fully charged battery typically means one fewer stop on the way.
● Combine charging with your breaks: during lunch or a longer rest most cars take on a considerable amount of energy, so charging does not become a separate item on the agenda.
● Check a backup charging point too: if the station you picked first is occupied or out of service, it is good to have a plan B nearby.
● Keep track of consumption: in the Voltie mobile app you can look back at charging data and energy use, so over time you can estimate your own real range more accurately.
Keep in mind that range and consumption always depend on the car, the speed, the weather and your driving style, so it is worth starting from your own measured data, not from general factory figures.
Today the quality of a charger is not determined solely by the electronics inside the box. Just as important is what the software running behind it can do, and whether it keeps improving after installation. Voltie chargers receive regular OTA updates, typically every two weeks to monthly, so the system stays up to date years after installation and gains new features.
This matters especially where needs change over time: in apartment buildings, offices or company sites. In such environments power sharing, Prepaid RFID profiles (with kWh, time or unlimited quotas) and open integration (OCPP 1.6 JSON, HTTP API, Modbus RS485) make the system flexible. Alongside a solar system, Green and Eco mode help cover as much of the charging as possible from your own generation; this also requires the external smart meter, and Green mode is available in single-charger systems.
Charging an electric car becomes truly simple when the charging system adapts to everyday life, not the other way round. If you are planning to install a charger at home or at your company, take a look at the Voltie website, or read on on the Voltie blog.
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